I have two NEC MultiSync LCD 2070NX monitors connected (DVI) to a Dell Precision T5500 workstation with Windows 7 Professional. One monitor does not work properly. The screen is black, showing no picture. Remote controlling the computer, I can use both screens as if everything was OK.
Tested the monitor on another computer having Windows 10 Professional, similar hardware, and now connected with VGA, the same problem occurs. Everything is working fine remotely, as if there were two screens with no problems while remote controlling the computer. The monitor itself does not have any pictures, no display, and the screen stays black. A green lamp shows that the monitor is switched on.
Is the monitor broken? Can I somehow repair or fix this problem before throwing it?